Screw-propeller



[No Model.)

A. H. CARPENTER.

SCREW PROPELLER.

No. 597,632. Patented Jan 18, 1898.

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SCREW PROPELLER.

SPECIFICATION forming part of Letters Patent No. 597,632, dated January18, 1898.

Application filed 13 T0 ctZZ whom it may concern:

Beitknown that I, AMOS I-I. CARPENTER, a citizen of the United States,residing at Stockton, in the county of San Joaquin and State ofCalifornia, have invented a new and useful Screw-Propeller, of which'thefollowing is a specification.

This invention relates to screw-propellers, and has for its object toprovide, in connection with a boat or vessel having a hull of specialform, a buoyant propeller in the form of a hollow cylinder with closedends, having one or more spiral flanges extending continuously from endto end thereof. The hull is shaped so as to form a guard for the frontend of the propeller, while the rear end of the propeller is journaledin a rearwardly tapering and pointed conical bearing supported beneaththe hulls counter.

Other objects and advantages of the invention will appear in the courseof the subjoined description.

The invention consists in certain novel features and details ofconstruction and arrangement of parts, as hereinafter fully described,illustrated in the drawings, and incorporated in the claims.

In the accompanying drawings, Figure 1 is a side elevation of a vesselshull, showing the improved. propeller and its relation thereto. Fig. 2is an enlarged perspective View of the propeller, rudder, the. and thecontiguou s por tions of the hull. Fig. 3 is a longitudinal sectionthrough the same. Fig. 4 is a cross-section thereof.

Similar numerals of reference designate corresponding parts in theseveralfigures of the drawings.

Referring to the drawings, 1 designates a vessels hull, which in themain may be of any usual or preferred construction. For the purpose ofcarrying out the present invention the stern of the hull is cut awayrectangularly to form a substantially horizontal counter 2 and avertical end wall lei, beneath which counter 2 the propeller 3 isjournaled, the axis of r0- tation of the propeller being parallel withsaid counter and its forward end immediately in the rear of the verticalwall 14.

The propeller consists of a hollow cylinder 3, closed at each end andrigidly mounted on a shaft 4, which passes through the stern of thepropeller is revolved by the motor.

Serial No. 609,076. (No model.)

boat into the interior, where it may be operatively connected to anysuitable motor. (Not shown.) The shaft at projects beyond the cylinderat its rear end and enters a tapering and rearwardly-pointed cone-shapedbearing 6, mounted rigidly on the lower end of a post '7, which isconnected at its upper end by means of a cap-plate 8 to the counter 2.The cy1inder 3 is provided exteriorly with one or more flanges 9,extending spirally around the same and from end to end thereof, saidflanges serving as acontinuous screw for catching the water andpropelling the boat forward or backward, according to the direction inwhich the That portion of the hull of the vessel extending forwardlyfrom the verticalwall 14 is shaped on its opposite sides imniediatelyinfront of the cylinder 3 to correspond in outline with and form a flushcontinuation of the surface of the cylinder and the vertical wall 14 atthis point, and thereby forms a water-guard which protects and coversthe front end of the cylinder and prevents the water from strikingagainst the same and impeding the progress of the vessel,while at thesame time the water passes freely to the spiral flanges or blades 9,which are thus enabled to takea firm hold thereon.

The forward surface of the conical bearing 6 also corresponds exactlywith the rear end of the cylinder, and the water thus passes freely 01fthe rear end of the cylinder and slides easily from the point of saidconical bearing, and thus no obstruction or suction is produced whichwould interfere with the rapid progress of the vessel.

By reference to the cross-sectional view it will be seen that thecounter is brought to a longitudinal depending ridge 10 just over and invertical alinement with the axis of the propeller. A substantially Vshape is thus given to the rear portion of the hull, which admits of thewater freeing itself the more easily from the hull when agitated by thepropeller. The post 7 is brought to a sharp edge at its front, so as toout the water and afford less obstruction to the progress of the boat.

11 designates the rudder, which is arranged in rear of the post 7 andprovided with a V- shaped cut-out 12, so as to straddle the conicalbearing 6 at its rear end. The rudder 11 is connected above and beneaththe bearing 6 to the rudder post or shaft 13, which passes through andhas a bearing in the cone 6, the upper end of said shaft extendingthrough the hull of the vessel and inside thereof, where it is connectedto any suitable steering mechanism.

From the foregoing description it will be seen that a very simple andefiective screwpropeller is provided and that the same is submerged andso mounted beneath the hull of the vessel that it affords no obstructionwhatever to the forward or backward movement of the vessel, and as thepropeller is not inclosed the water can pass freely to the spiral bladesfrom all directions.

The hollow cylinder of the propeller is made air-tight and by itsbuoyancy serves to compensate for the loss of buoyancy resulting fromthe cutting away of the rear portion of the hull.

It will be understood that more than one of the propellers abovedescribed may be used where the hull has considerable beam and that thelength of the propeller may be varied to suit the size of the vessel andother requirements. It will also be understood that changes in the form,proportion, and minor details of construction may be resorted to withoutdeparting from the spirit or sacrificing any of the advantages of thisinvention.

Having thus described the invention, what is claimed as new is 1. Thecombination with a vessels hull having its stern cut away as described,of a submerged screw-propeller j ourn aled beneath the counter on alongitudinal axis and consisting of a hollow cylindrical body and one ormore spiral blades or flanges extending around the same continuouslyfrom end to end, a rearwardly-tapering conical bearing for the rear endof said propeller, a post or upright securing said bearing to the hull,said post being brought to a sharp edge at its front, a rudder post orshaft passing through and journaled in said conical bearing, and arudder-blade having a V-shaped cut-out to embrace the pointed end ofsaid conical bearing and secured to said rudder post or shaft above andbeneath the conical bearing, substantially as described.

2. The combination with a vessels hull having its rear portion cut outto form a vertical end wall, and a substantially horizontal counterextending rearwardly from said wall, the counter being practicallyV-shaped in cross-section, of a submerged screw-propeller consisting ofa hollow cylinder arranged beneath the counter and journaled on an axisparallel therewith, with its front end in close proximity with thevertical wall, and one or more spiral blades or flanges extending aroundthe cylinder from end to end, the surface of the hull immediately infront of the cylinder being so bulged outwardly on its opposite sides asto form a flush continuation of the surface of the cylinder extendingforwardly to the bow, wherebythe vertical wall forms a Water-guard forthe end of the cylinder but presents no obstruction between the waterand'the propeller-blades, the construction being such that the water canpass freely from all directions to the propeller-blades,

substantially as described.

In testimony that I claim the foregoing as AMOS H. OARPENTE R.

\Vitnesses:

T. G. ELLIOTT, A. V. SCANLAN.

